Fracture in Bulk Amorphous Alloys

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The fracture behavior of a Zr-based bulk amorphous alloy, Zr-10 AI-5 Ti-17.9 Cu-14.6 Ni, was examined by transmission electron microscopy (TEM) and x-ray diffraction for any evidence of crystallization preceding crack propagation. No evidence for crystallization was found in shear bands in compression specimens or at the fracture surface in tensile specimens. In- situ TEM deformation experiments were performed to more closely examine actual crack tip regions. During the in-situ deformation experiment controlled crack growth occurred to the point where the specimen was approximately 20 {micro}m thick at which point uncontrolled crack growth occurred. No evidence of any crystallization was ... continued below

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6 p.

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Horton, J. A. & Wright, J. L. November 30, 1998.

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Description

The fracture behavior of a Zr-based bulk amorphous alloy, Zr-10 AI-5 Ti-17.9 Cu-14.6 Ni, was examined by transmission electron microscopy (TEM) and x-ray diffraction for any evidence of crystallization preceding crack propagation. No evidence for crystallization was found in shear bands in compression specimens or at the fracture surface in tensile specimens. In- situ TEM deformation experiments were performed to more closely examine actual crack tip regions. During the in-situ deformation experiment controlled crack growth occurred to the point where the specimen was approximately 20 {micro}m thick at which point uncontrolled crack growth occurred. No evidence of any crystallization was found at the crack tips or the crack flanks. Subsequent scanning microscope examination showed that the uncontrolled crack growth region exhibited ridges and veins that appeared to have resulted from melting. Performing the deformations, both bulk and in-situ TEM, at liquid nitrogen temperatures (LN{sub 2}) resulted in an increase in the amount of controlled crack growth. The surface roughness of the bulk regions fractured at LN{sub 2} temperatures corresponded with the roughness of the crack propagation observed during the in-situ TEM experiment, suggesting that the smooth-appearing room temperature fracture sur-faces may also be a result of localized melting.

Physical Description

6 p.

Notes

OSTI as DE00003653

Medium: P; Size: 6 pages

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  • Fall Meeting of the Materials Research Society, Boston, MA (US), 11/30/1998--12/04/1998

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  • Report No.: ORNL/CP-101115
  • Report No.: KC 02 01 05 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 3653
  • Archival Resource Key: ark:/67531/metadc678307

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  • November 30, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 11, 2017, 2:32 p.m.

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Horton, J. A. & Wright, J. L. Fracture in Bulk Amorphous Alloys, article, November 30, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc678307/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.